Cheapest priced copy (Duskmourn: House of Horror Commander): $0.79 at Card Kingdom, near mint, their price list as of .
Otherworldly Gaze 
Instant · Common · Murders at Karlov Manor Commander · #115
Surveil 3. (Look at the top three cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
Flashback {1}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
5 printings · $0.79 to $12.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 67 | Common | $2.79 | $12.99 |
| Duskmourn: House of Horror Commander | 122 | Common | $0.79 | — |
| Innistrad: Midnight Hunt | 67 | Common | $0.79 | $2.49 |
| Murders at Karlov Manor Commander | 115 | Common | $0.99 | — |
| Secret Lair Drop | 2069 | Rare | $9.99 | $11.99 |
7 rulings from Wizards of the Coast
- 12 January 2024When you surveil, you may put all the cards you look at back on top of your library, you may put all of those cards into your graveyard, or you may put some of those cards on top and the rest of them into your graveyard.
- 6 June 2025To determine the total cost of a spell, start with the mana cost or alternative cost (such as a flashback cost) you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.
- 6 June 2025"Flashback [cost]" means "You may cast this card from your graveyard if the resulting spell is an instant or sorcery spell by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack."
- 6 June 2025You must still follow any timing restrictions and permissions, including those based on the card's type. For instance, you can cast a sorcery using flashback only when you could normally cast a sorcery.
- 6 June 2025If a card with flashback is put into your graveyard during your turn, you can cast it if it's legal to do so before any other player can take any actions.
- 6 June 2025A spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way.
- 6 June 2025You can cast a spell using flashback even if it was somehow put into your graveyard without having been cast.